3Martinez G, Velazquez K E, Gregory Y, et. al. Vleck. Genetie relationships between scrotal circumference and male reproductive traits[J]. J. Anim. Sci., 2003, 81:395-401.
4Bourdon, R, M, Brinks J S. Scrotal circumference in yearling Hereford bulls: Aajustment factors, heritabilities and genetic, environmental and phenotypic relationships with growth traits[J]. J. Anim. Sci., 1986, 62:958.
5Kriese L A, Bertrand J K, Benyshek L. L Age adjustment factors, heritabilities and correlations for serotal circumference and related growth traits in Hereford and brangus bull[J]. J. Anim. Sci., 1991, 69:478.
6Martinez G,Velazquez K E ,GregorY,et. al. Vleck. Genetie relationships between scrotal circumference and male reproductive traits [J] . J. Anim. Sci. ,2003, (81) :395--401
7Bourdon.R M,Brinks J S. Scrotal circumference in yearling Hereford bulls:Aajustment factors,heritabilities and genetic, environmental and phenotypic relationships with growth traits[J]. J. Anim. Sci, 1986, (62) :958.
8Kriese L A,Bertrand J K,Benyshek L. L Age adjustment factors, heritabilities and genetic correlations for scrotal circumference and related growth traits in Hereford and brangus bulls. [J]. J. Anita. Sci, 1991, (69) :478.
10Arione Augusti Boligon, Fernando Baldi, Lucia Galvao de Albuquerque,et al.Genetic parameters and relation- ships between growth traits and scrotal circumference measured at different ages in Nellore cattle[J].Genetics and Molecular Biology,2011,34(2) :225-230.
